Emulsified solid grease



Patented June 14, 1927.

UNITED STATES PATENT OFFICE.

EMULSIIEIED SOLID GREASE.

No Drawing. Application filed April 8, 1925, Serial No. 21,698, and in Germany April 10, 1924.

The requirements in connection with the lubrication of the axles of trucks and tubs and consequently the demands made on the lubricants used for this purpose are totally different from those made on the lubrication and the lubricants for the axles of other types of vehicles. Hitherto lubricants capable of being extruded and consisting of machine greases thinned with oil have been used for lubricating the axles of such trucks. According to tests made, emulsified solid greases containing a far greater percentage of water than the solid greases used hitherto may be used for this purpose. Stiff greases known at present contain about five percent water as a maximum. The water content may amount to 50% and more. The best emulsifying agents for the mineral oils used for making the new solid greases are polymerized oils, such as voltol oil, with which or instead of which other oil-soluble emulsifying agents may be used, such as wool-fat, wool-fat alcohols, Montan wax and the like. Voltol oil is made in the following manner: Hydrocarbon oil is introduced into a vessel in which are a plurality of rotatable electrodes separated by a dielectric. The vessel is filled with hydrogen at a sub-atmospheric pressure. The electrodes are sub- 3 ratus. The oil in the chamber is caused to rotation thereof. The oil is kept at a temperature of between 60 and 80 degrees. The electrical discharges arising from the individual electrode plates convert the rotating electrodes which are covered with oil into a flame roll of rose violet color. The oil falling onto and trickling over the electrodes is subjected to the electrical oscillations previously mentioned. The oil, after it has been subjected to this type of electrical treatment, is then treated as below. The emulsification may for instance be effected by the atomized mineral oils, in which voltol oil or other oil-soluble emulsifying agents are dissolved,

jected to a potential ranging between 4300 trickle over the electrode surfaces. by the being brought together with the atomized water.

Voltol oil is introduced into an open boiler or container and heated by a current of steam until it no longer takes up any steamwherein at the same time the voltol oil is energetically agitated by the steam current passing from the oil. The water is then high percentage of water completely fulfil as regards their properties all requirements as to the good lubrication of the axles of trucks. The moving parts subject to friction are moved on small spheres ofwater on the surface of the lubricating film. On the water evaporating, the lubrication'will be pure oil lubrication without any detrimental effect due to friction, such as would occur if there were any soap, present. The new solid greases having a high percentage of water have'the further advantage of being cheap, in which respect they even surpass the tar oil extrudable greases, which have also been used hitherto.

The new emulsified solid grease can for instance be madefroin 50 parts of electrically treated oil of high viscosity (3040 Engler at 100 C'.) and 50 parts of water; or from 42 parts of thin liquid mineral oil, 6 parts of wax, 2 parts of highly viscous oil made by electric treatment and 50 parts of water; or from 42 parts of tar oils suitable for lubricating purposes, 6 parts of paraffin wax; 2 parts of highly viscous oil made by electric treatment and 50 parts of water.

What I claim is 1. An emulsified solid grease containing a relatively high percentage of water comprising mineral lubricating 011, water and polymerized oil, said polymerized oil and lubricating oil being soluble in each other and quantity to 5 Water in the lubricating 2. An emulsified solid claim 1, containing in ad i emulsifying agent compris said polymerized oil being in sufficientinsure emulsification of said rease as defined in tion an oil soluble ing a higher alco- MORITZ JOSEPH HEITMANN. 

